In the following question, a statement of assertion is followed by a statement of reason . Mark the correct choice.
Assertion : ` [Cu(NH_(3))_(4)]^(2+)` is coloured while ` [Cu(CN)_(4)]^(3-)` is colourless .
Reason : ` [Cu(NH_(3))_(4)]^(2+)` has ` dsp^(2)` hydridisation
A. Both assertion and reason are true and reason is the correct explanation of assertion .
B. Both assertion and reason are true but reason . Is not the correct explanation of assertion.
C. Assertion is true but reason is false.
D. Both assertion and reason are false.
